Baron Blood is another vampire.
Johann Kraus is an ectoplasmic energy that 'survived' the death of his physical body.
By a stretch - Cyborg Superman is a consciousness that has done that too.
Crimson Avenger I assume is an undead too? ("minor spirit of vengeance" after all)
Lt. Col. Valentina Vostok of the Soviet Air Force stole an experimental Russian Fighter Plane in order to defect to the USA. The plane malfunctioned en route and she crash-landed at the spot where the original Doom Patrol had apparently perished and was fused with the negative energy being which formerly inhabited the body of the Patrol's Negative Man. However, instead of being inhabited by the entity, rendered radioactive by its presence, and able to send it out from her body under her control, Vostok merely gained the ability to transform herself into such a being.